Polysubstituted triphenylenes with active groups. Molecular parameters, synthesis, structure, and mesomorphism |
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Authors: | O B Akopova A A Bronnikova A Kruvchinskii L N Kotovich L S Shabyshev L A Valkova |
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Abstract: | Molecular parameters of hexaalkoxytriphenylenes with different substituents on the periphery of the triphenylene nucleus of
known and hypothetical structures are calculated. The probability of a discophase for compounds of this series is estimated
from molecular parameters. Several compounds of this series having polar groups (NO2, NH2) in the 1 position of the triphenylene nucleus have been synthesized. The compounds synthesized were investigated by thermopolarizing
microscopy and X-ray diffraction analysis. The data on the mesomorphism of the new compounds are in good agreement with our
prediction that alkoxytriphenylenes with polar groups have a discophase. It is established that introduction of an electron-accepting
group at position 1 of the triphenylene nucleus expands the temperature range of existence of the discophase to room temperature.
On the contrary, introduction of an electron-donating group narrows this interval. Compounds of this series presumably have
a hexagonal columnar structure.
Ivanovo State University. Warsaw University. Translated fromZhurnal Strukturnoi Khimii, Vol. 39, No. 3, pp. 464–472, May–June, 1998.
This work was supported by RFFR grant No. 96-02-19036. |
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